| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // UNSUPPORTED: c++03, c++11, c++14, c++17 |
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| 10 | |
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| 11 | // reverse_iterator |
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| 12 | |
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| 13 | #include <iterator> |
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| 14 | |
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| 15 | #include "test_iterators.h" |
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| 16 | |
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| 17 | template<class T> concept HasMinus = requires (T t) { t - t; }; |
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| 18 | |
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| 19 | using sized_it = random_access_iterator<int*>; |
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| 20 | static_assert( std::sized_sentinel_for<sized_it, sized_it>); |
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| 21 | static_assert( std::sized_sentinel_for<std::reverse_iterator<sized_it>, std::reverse_iterator<sized_it>>); |
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| 22 | static_assert( HasMinus<std::reverse_iterator<sized_it>>); |
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| 23 | |
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| 24 | // Check that `sized_sentinel_for` is false for `reverse_iterator`s if it is false for the underlying iterators. |
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| 25 | using unsized_it = bidirectional_iterator<int*>; |
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| 26 | static_assert(!std::sized_sentinel_for<unsized_it, unsized_it>); |
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| 27 | static_assert(!std::sized_sentinel_for<std::reverse_iterator<unsized_it>, std::reverse_iterator<unsized_it>>); |
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| 28 | static_assert(!HasMinus<std::reverse_iterator<unsized_it>>); |
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| 29 | |
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